The theory proposing light as a particle is supported by
1.the sparks created in Hertz' experiment with the spark gap oscillator.
2.the speed of light turning up in Maxwell's equations.
3.the interference caused by light in Young's double slit experiment.
4.the photoelectric effect Hertz discovered.
4
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A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
a. 83% b. 65% c. 43% d. 90% e. 56%
A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
A) infinite B) -30 cm C) 18 cm D) 38 cm E) -19 cm
If you add two vectors with magnitudes of 200 and 40, which of the following is the only possible resultant?
A. 100 B. 260 C. 0 D. 200 E. 40
Anders and Taisen release their snowballs from the same height and at the same time. Ander's is dropped while Taisen’s is thrown horizontally. Which one hits the ground first?
A. the "dropped" snowball B. the "thrown" snowball C. they hit at the same time D. it depends on how hard Taisen threw E. it depends on the initial height